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get_name_and_tags_from_asset_path raises ValueError by contract when a path stops resolving to a configured root, and it sat outside the guard, as did compute_loader_path and mimetypes.guess_type. An escape skipped the _WATCH_LIST[:] = remaining write at the end, so drained entries stayed on the list and were re-attempted every tick while entries past the fault never reached the increment _WATCH_SCAN_RETRIES needs to retire them. The list wedged permanently. Spec construction is now inside a guard that drops just the offending entry, and the list write moved into a finally so no future escape can skip it. The loop walks an iterator rather than the list, so the finally can put back the entries it never reached instead of discarding them. New event name rather than reusing one: scanner.watch_seed_failed is emitted only when seed_asset_specs returns an error, and widening it to also mean "never got as far as seeding" would make it lie -- a consumer treating it as a database-health signal would get false positives from what is really a path layout problem. scanner.watch_spec_failed is registered in ALLOWED_EVENTS and in the static call-site manifest.
Pytest Unit Tests
Install test dependencies
pip install -r tests-unit/requirements.txt
Run tests
pytest tests-unit/